[BackgroundSync Cleanup] Remove power observer

content/content_tests.gypi

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'layouttest_support_content_sources': [
       'public/test/layouttest_support.h',
       'public/test/nested_message_pump_android.cc',
       'public/test/nested_message_pump_android.h',
@@ skipping 346 matching lines @@
       'browser/appcache/chrome_appcache_service_unittest.cc',
       'browser/appcache/mock_appcache_policy.cc',
       'browser/appcache/mock_appcache_policy.h',
       'browser/appcache/mock_appcache_service.cc',
       'browser/appcache/mock_appcache_service.h',
       'browser/appcache/mock_appcache_storage.cc',
       'browser/appcache/mock_appcache_storage.h',
       'browser/appcache/mock_appcache_storage_unittest.cc',
       'browser/background_sync/background_sync_manager_unittest.cc',
       'browser/background_sync/background_sync_network_observer_unittest.cc',
-      'browser/background_sync/background_sync_power_observer_unittest.cc',
       'browser/background_sync/background_sync_service_impl_unittest.cc',
       'browser/blob_storage/blob_async_builder_host_unittest.cc',
       'browser/blob_storage/blob_async_transport_strategy_unittest.cc',
       'browser/blob_storage/blob_storage_registry_unittest.cc',
       'browser/browser_thread_unittest.cc',
       'browser/browser_url_handler_impl_unittest.cc',
       'browser/byte_stream_unittest.cc',
       'browser/cache_storage/cache_storage_blob_to_disk_cache_unittest.cc',
       'browser/cache_storage/cache_storage_cache_unittest.cc',
       'browser/cache_storage/cache_storage_manager_unittest.cc',
@@ skipping 1838 matching lines @@
                   'content_unittests_apk.isolate',
                 ],
               },
             ],
           },
         ],
       ],
     }],
   ],
 }